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If he could see any stars it speaks well for his eyes. I simulated the lunar surface in daylight with some translucent material over a floodlight and checked the brightness with an exposure meter. While holding it horizontally just under my nose I could see Arcturus with some difficulty and Antares with great difficulty. Not only did the light cause my eyes to become somewhere near daylight adapted, it created glare in my eyes that washed out the dark sky. This was without any further impairment from a helmet visor.

A quick Google search did not reveal anything meaningful about what Aldrin saw, but I have seen plenty of references in which the astronauts reported that they could see only the brightest stars, and with difficulty. Only when the spacecraft was shadowed by the Earth or the Moon did the night sky appear with its full glory.

If he could see any stars it speaks well for his eyes. I simulated the lunar surface in daylight with some translucent material over a floodlight and checked the brightness with an exposure meter. While holding it horizontally just under my nose I could see Arcturus with some difficulty and Antares with great difficulty. Not only did the light cause my eyes to become somewhere near daylight adapted, it created glare in my eyes that washed out the dark sky. This was without any further impairment from a helmet visor.

A quick Google search did not reveal anything meaningful about what Aldrin saw, but I have seen plenty of references in which the astronauts reported that they could see only the brightest stars, and with difficulty. Only when the spacecraft was shadowed by the Earth or the Moon did the night sky appear with its full glory.

Addendum: Looking straight up while standing in his spacesuit would have been difficult.